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Old 09-07-2011, 01:39 AM
PlasticBoob's Avatar
PlasticBoob PlasticBoob is offline
All Makes Combined
Join Date: Jun 30, 2003
Location: Long Beach, CA
Posts: 4,007
Post Prissy cold air intake parts list

Excuse the engine bay wiring mess, this is not how I plan to keep it.

Okay, it's really late so I have to kind of rush through this. Hopefully I'll cover everything. I went with a 4" system because I figured some day a hi-performance MPFI 401 might need it, but in retrospect I think 3" would have been fine. I will list both 3" and 4" part numbers. Pricey? Yes! Worth it? Definitely, to me anyway!

And to answer some questions from this thread, my Jeep did not have the coolant and washer reservoirs when I bought it. Seeing as the battery is on the other side, this is the only way I could get a true cold air intake without going with a snorkel or cutting into the fender.

The Plenum
3": It seems we have a problem here. I can't seem to find the most important piece anywhere. Maybe they stopped producing it when they discontinued the black crinkle coated 4" plenum?
4": Spectre 9843 (out of production? try: Spectre 9849 )
This goes on the carb. Most descriptions say it only fits 4bbl carbs or TBI units.

Memory Flex Ducting
3": Spectre 8741
4": Spectre 9751

Air filter and housing
3": Spectre 9833
4": Spectre 9831

Cold air mounting flange
3": Spectre 8148
4": Spectre 9148

You will need to drill the radiator support with a hole saw or find some other way to open it up.

Miscellaneous stuff

Straight tubes
I'm not sure if I used a 4" or 6" long tube, I *think* the 4" will work but you may want to measure yourself before ordering.

3" diameter, 4" long: Spectre 9409
3" diameter, 6" long: Spectre 9419

4" diameter, 4" long: Spectre 9709
4" diameter, 6" long: Spectre 9719

Two required.
3": Spectre 8771
4": Spectre 9771

I found the extremely large clamps and mounting plates for the air filter box at Home Depot. Note that if you have EFI, you will either need to drill the aluminum tube or the plenum for the IAT sensor. Datalogs show a HUGE decrease in intake air temps, from something like 150-180* down to around ambient, and the performance increase when the engine is warm (and especially on hot days) is like night and day. Idling on a hot day brings the temps up to around 130, compared with 180 or so without a cold air intake. As soon as the Jeep starts rolling, they decrease back down to ambient.
1974 Cherokee S, fuel injected 401, Trans-am Red, Aussie locker 'out back'
Click for video

Last edited by PlasticBoob : 01-30-2019 at 01:19 AM.
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Old 09-07-2011, 07:36 PM
Mavawreck Mavawreck is offline
FSJ Maniac
Join Date: Jan 02, 2003
Location: Delawhere
Posts: 3,428
I really like the end product, I'm wondering if a '80s cadillac TBI hat could be substituted to save some scratch.
1988 Jeep Grand Wagoneer

1996 T100 SR5
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Old 09-07-2011, 08:17 PM
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Rockwell_B1 Rockwell_B1 is offline
Join Date: Jun 28, 2011
Location: Marion, Ohio
Posts: 195
Well this is getting added to my to-do list, if I have a 4bl that is.

Past Jeeps:
1974 J10 LWB 4x4 304 V8
1991 MJ Eliminator 4x4 4.0L HO
'86 MJ X LWB 4x4 2.8L & '88 MJ Eliminator 4.0L
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Old 09-07-2011, 09:17 PM
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rmorit01 rmorit01 is offline
Master Mechanic
Join Date: Nov 13, 2004
Location: Marshfield, WI
Posts: 1,001
I found I could assemble your system for just a tad under $150.00 at streetside auto - It looks like this would really work well for my TBI system -

Thanks for the details -

Here is a link to the shopping cart I created -

79 Cherokee S

Last edited by rmorit01 : 09-07-2011 at 09:31 PM.
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Old 09-08-2011, 05:29 AM
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The Colonel The Colonel is offline
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Join Date: Feb 21, 2010
Location: Chicagoland
Posts: 2,842
Looks good Rob.

Really neat seeing the before and after difference it made using the IAT sensor.

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Old 09-08-2011, 08:53 AM
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JohnnyJ JohnnyJ is offline
258 I6
Join Date: Jan 21, 2001
Location: Southeast Michigan
Posts: 418
You can get a really cheap TBI plenum (with tube and junky air cleaner) for the 88 Chevy on fle-bay. The plenum is pretty reasonable. Oh did I mention cheap?
Past Project: Stock Class TREC Racer Build Thread
Current project: bringing back my 75 Wagoneer
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Old 09-08-2011, 11:25 AM
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rreed rreed is offline
350 Buick
Join Date: Aug 21, 2006
Location: Texas
Posts: 1,472
Yeah, I was thinking that's totally awesome (dude) until I saw the $99 price on just the plenum. I've been wanting to do this for a long time but would have to find a much cheaper source for parts.

Awesome write-up though!!
47 Willys
75 CJ-5
81 Scrambler
76/79/80/81/85 J20 (all the same truck)
86 Grand Wagoneer - FOR SALE!!!
96 ZJ

Member, FSJ Prissy Restoration Association

You can't drink all day if you don't start in the morning.
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Old 09-08-2011, 08:40 PM
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Wagn Man Wagn Man is offline
Grease Monkey
Join Date: Jun 23, 2009
Location: Tyler, TX
Posts: 434
Excellant, I will be in need of such info. I'd hate to cover up my Edelbrock MPFI with the clunky stock unit.
78 Chero NT..... nickname "Crash"
84 GW 401, Rhino Grille
03 Chevy Silverado 2500HD My DD/Tow Rig
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